Internal test circuits for color palette device
First Claim
1. A palette device controllable by a digital computer to produce signals representing color for a color display device, said palette device comprising:
- a digital video input for receiving a stream of digital video signals representing a color display;
a look-up table memory connected to said digital video input and employing each digital video signal as an address for recall of a color code consisting of a plurality of bits stored therein;
a digital to analog conversion circuit connected between said look-up table memory and an output of the palette device for connection to the color display device, said digital to analog conversion circuit converting said color codes recalled from said look-up table memory into analog video signals; and
accumulator circuitry connected to the look-up table memory to receive said color codes recalled from said look-up table memory, said accumulator detecting the number of bits within the plurality of bits of each color code recalled from said look-up table memory having a particular state and accumulating said detected number of bits for each color code over a period of time between vertical synchronization pulses to thereby generate an externally accessible count of the number of bits having a particular state that are supplied at a given set of outputs of the memory over a period of time between vertical synchronization pulses.
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Abstract
An integrated circuit including a semiconductor chip and chip circuitry including memory circuitry and additional non-memory circuitry all fabricated on the semiconductor chip. The chip circuitry has a defined set of locations having logic states including a first logic state and at least one other logic state. A semiconductor chip package has pins connected to the chip circuitry. Accumulator circuitry on-chip and connected to the chip circuitry generates a count of the the number of locations in the set that have the first logic state. The semiconductor chip package has pins connected to the chip circuitry and accumulator circuitry for external access to the count. Other integrated circuits, palette devices, computer graphics systems and methods are disclosed.
46 Citations
20 Claims
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1. A palette device controllable by a digital computer to produce signals representing color for a color display device, said palette device comprising:
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a digital video input for receiving a stream of digital video signals representing a color display; a look-up table memory connected to said digital video input and employing each digital video signal as an address for recall of a color code consisting of a plurality of bits stored therein; a digital to analog conversion circuit connected between said look-up table memory and an output of the palette device for connection to the color display device, said digital to analog conversion circuit converting said color codes recalled from said look-up table memory into analog video signals; and accumulator circuitry connected to the look-up table memory to receive said color codes recalled from said look-up table memory, said accumulator detecting the number of bits within the plurality of bits of each color code recalled from said look-up table memory having a particular state and accumulating said detected number of bits for each color code over a period of time between vertical synchronization pulses to thereby generate an externally accessible count of the number of bits having a particular state that are supplied at a given set of outputs of the memory over a period of time between vertical synchronization pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer graphics system comprising:
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a digital computer; a video memory connected to said digital computer and operable to store color codes representing color information; a palette device connected to said video memory and accessible by said digital computer to produce signals representing color for a color display device, said palette device including a look-up table memory having sets of bits stored therein representing color data words output in response to assertion of the color codes from the video memory, said color data words having a plurality of bits; a digital to analog conversion circuit connected to convert the color data words from said look-up table memory and thereby supply an analog color signal as output from the palette device; and accumulator circuitry connected to the look-up table memory to receive said color data words recalled from said look-up table memory, said accumulator detecting the number of bits within the plurality of bits of each color data word recalled from said look-up table memory having a particular state and accumulating said detected number of bits for each color data word over a period of time between vertical synchronization pulses to thereby generate an externally accessible count of the number of bits having a particular state that are supplied at a given set of outputs of the memory over a period of time between vertical synchronization pulses. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification